Q&A: Sleeping on One’s Back
Originally published:
This is an English translation (via GPT-5.4). Read the original Hebrew version.
Sleeping on One’s Back
Question
Hello Rabbi, good morning.
Is there really a halakhic prohibition against sleeping on one’s back? If so, does that also apply while awake? And why is it prohibited?
Answer
I think people are not particular about this. According to most opinions, the reason is concern about seminal emission, and in my humble opinion there is no significant concern of that sort here.
The prohibition against sleeping on one’s stomach is because of concern about seminal emission; the prohibition against sleeping on one’s back is because one may become disgraced in a state of erection. Apparently everything depends on the circumstances; if he is covered with a blanket, then there is no basis to prohibit it.